Use u32 instead of usize in Retry::Attempts

An upcoming commit requires serializing Retry, so use a type with a
fixed byte length. Otherwise, using eight bytes to serialize a usize
would fail to read on 32-bit machines.

diff --git a/lightning/src/ln/outbound_payment.rs b/lightning/src/ln/outbound_payment.rs
index 712f33e99f235eef1dc7b79b28dcf5c57ea16021..a1c6596784e27c6d70d5811589ee440d5fb39704 100644 (file)
--- a/lightning/src/ln/outbound_payment.rs
+++ b/lightning/src/ln/outbound_payment.rs
@@ -263,7 +263,7 @@ pub enum Retry {
        /// Each attempt may be multiple HTLCs along multiple paths if the router decides to split up a
        /// retry, and may retry multiple failed HTLCs at once if they failed around the same time and
        /// were retried along a route from a single call to [`Router::find_route_with_id`].
-       Attempts(usize),
+       Attempts(u32),
        #[cfg(not(feature = "no-std"))]
        /// Time elapsed before abandoning retries for a payment. At least one attempt at payment is made;
        /// see [`PaymentParameters::expiry_time`] to avoid any attempt at payment after a specific time.
@@ -305,7 +305,7 @@ pub(crate) type PaymentAttempts = PaymentAttemptsUsingTime<ConfiguredTime>;
 pub(crate) struct PaymentAttemptsUsingTime<T: Time> {
        /// This count will be incremented only after the result of the attempt is known. When it's 0,
        /// it means the result of the first attempt is not known yet.
-       pub(crate) count: usize,
+       pub(crate) count: u32,
        /// This field is only used when retry is `Retry::Timeout` which is only build with feature std
        #[cfg(not(feature = "no-std"))]
        first_attempted_at: T,